把秒转换成分钟或秒

#include <stdio.h>

#define  SEC_PER_MIN60

void main()

{

    int sec ,min ,left ;

    printf("convert seconds to minutes and seconds !\n");

    printf("ENTER the number of seconds ( <= 0 to quit ) : \n");

    scanf ("%d", &sec);

    while (sec > 0 ) {

        min = sec /SEC_PER_MIN ;

        left = sec %SEC_PER_MIN ;

        printf("%d sewconds is %d minutes , %d seconds .\n ", sec ,min ,left);

        printf("ENTER the number of seconds ( <= 0 to quit ) : \n");

        scanf( "%d", &sec);

    }

    printf("Done !\n");

}